package com.heima.app.gateway.filter;

import com.heima.app.gateway.utils.AppJwtUtil;
import io.jsonwebtoken.Claims;
import lombok.extern.slf4j.Slf4j;
import org.apache.commons.lang.StringUtils;
import org.springframework.cloud.gateway.filter.GatewayFilterChain;
import org.springframework.cloud.gateway.filter.GlobalFilter;
import org.springframework.core.Ordered;
import org.springframework.http.HttpStatus;
import org.springframework.http.server.reactive.ServerHttpRequest;
import org.springframework.http.server.reactive.ServerHttpResponse;
import org.springframework.stereotype.Component;
import org.springframework.web.server.ServerWebExchange;
import reactor.core.publisher.Mono;

/**
 * @author Xiao
 * @version 1.0
 * @description 权限校验
 * @date 2021/11/20
 */
@Component
@Slf4j
public class AuthorizeFilter implements Ordered, GlobalFilter {
    /**
     * 拦截器
     * @param exchange
     * @param chain
     * @return
     */
    @Override
    public Mono<Void> filter(ServerWebExchange exchange, GatewayFilterChain chain) {
        //获取request和response对象
        ServerHttpRequest request = exchange.getRequest();
        ServerHttpResponse response = exchange.getResponse();
        //判断是否登录
        if (request.getURI().getPath().contains("/login")) {
            return chain.filter(exchange);
        }
        //获取token并校验
        String token = request.getHeaders().getFirst("token");
        //校验token是否为空
        if (StringUtils.isEmpty(token)) {
            response.setStatusCode(HttpStatus.UNAUTHORIZED);
            return response.setComplete();
        }
        //校验token是否正确
        Claims claimsBody = AppJwtUtil.getClaimsBody(token);
        int verifyToken = AppJwtUtil.verifyToken(claimsBody);
        if (verifyToken == 1 || verifyToken == 2) {
            response.setStatusCode(HttpStatus.UNAUTHORIZED);
            return response.setComplete();
        }
        //获得token解析的用户信息
        Object userId = claimsBody.get("id");
        //在header中添加新的信息
        request = request.mutate().headers(
                httpHeaders -> httpHeaders.add("userId", userId.toString()))
                .build();
        //重置header
        exchange.mutate().request(request).build();
        //放行
        return chain.filter(exchange);
    }

    /**
     * 优先级设置  值越小  优先级越高
     * @return
     */
    @Override
    public int getOrder() {
        return 0;
    }
}
